xiv CONTENTS 
ing water ’—Sun-bursts and flying shadows in Scotland— 
Moon-bursts and moon beams—Shaded light—The law 
of shadows—Electric-light shadows—Shadows lightened 
by light-diffusion—Shadows in hot weather—The colored 
shadow—Scientifically explained—Complementary hues 
in shadow—Necessary conditions of the colored shadow— 
Blue shadows on snow—Lilac shadows on clay and sand 
—The mixed colors in nature—Shadow complications— 
The shadowless day—Odd colors in shadow—Shadows of 
the moon—And of the stars...................... 25 
Cuapter III. The Blue Sky.—Impressions of the 
sky—Transparency of the blue—Sky depth—Through the 
clouds—Sky reach—Sky lines seen at sea—Horizon 
lines—Sky lines seen from heights—Apparent changes 
across the face of the sky—Sky waves and undulations— 
The blue seen from mountain-tops—The Great Silence 
of the firmament—The blue seen from the valleys—Its 
changes by day and by night—The tenderness of its 
coloring—Our non-observance of the sky—And of sky 
tints—Alpine glows at home—Skies in different lands— 
Color changes through atmosphere—Season changes in 
the blue—Luminosity of the blue—Transmitted and 
reflected light—Sky lights on the earth—Reflection from 
the blue—Atmospheric reflection—Thbe dawn an illustra- 
tion of atmospheric reflection—And also a symbol in 
natural re BMODiwe sc ay ewe eeaiees Meeaew eM eee 47 
CuapteR IV. Clouds and Cloud Forms. — Cloud- 
making—Cloud forms—Why clouds float—Effect of the 
winds—Effect of the air-currents—Cloud caps—Banner 
clouds—Self-renewal of clouds—Clouds, how acted upon 
—How moved—Day and night clouds—Classification of 
the families—The cirrus—Whitencss of the cirrus—Color 
